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My '77 924 was
equipped with a 2.0 Liter Audi engine that is rated at 95 bhp.
Although it doesn't have much power, it still seems to do alright.
This engine has seen many days, and has somewhere around 300,000
miles on it. Depsite the miles on it, it seems to still run good. It
doesn't have the greatest oil pressure, and I have to run 20-50 oil
in it during the summer months. I have another engine from my '79
parts car that produces 110 bhp stock. I plan on doing some
modifications to it when I put it in the car, but I will talk about
that in my "What
is to come"
page. The transmission is a rear-mounted 4 speed manual trans-axle.
With the transmission in the rear, the car's weight ratio is near
50-50 front to rear. The idea of a rear-mounted transmission was put
into effect in the C5 Corvettes. Below is a picture and some
information on the engine and transmission.
Engine Design Specifications
Design 4-cylinder,
in-line engine, front mount Operating
cycle 4-stroke Lubrication Pressure
oil circulation from oil sump, full flow oil
filter Cylinder
block Grey cast
iron Cylinder
head Light
metal Valve
operation Overhead
camshaft (SOHC) Camshaft
drive Spur belt
drive Fuel
injection CIS
(Continuous Injection System, also known as
K-Jetronic)
Engine Specifications
Number of
cylinders 4 Bore
(in./mm) 3.41/86.50 Stroke
(in./mm) 3.32/84.40 Displacement
(cu.in./cu.cm) 121.06/1984 Compression
ratio 8.0:1 SAE
net-horespower 95 @
5,500 rpm SAE
net-torque 109.2 @
3,000 rpm Output
per liter (SAE net-hp) 48.08 Fuel
octane rating 87 CLC
rating on fuel pumps in U.S.A. Max.
permissible rpm 6,500
Recommended
spark plugs Bosch W
200 T 30 or Beru 200/14/3 A Electrode
gap 0.028
in./0.7 mm Alternator
output Three-phase,
1050 watts/ 75 A Firing
order 1 -- 3 --
4 -- 2 Ignition
timing 10 deg.
± 1 deg. after TDC at 925 rpm ± 75 rpm, vacuum
control connected Ignition Transistorized
ignition system with breakerless distributer Valve
clearance, warm engine Intake
0.0078 in/0.20 mm; exhaust 0.018 in./0.45 mm
Power Train
Manual
Transmission Number
of teeth Gear
ratio Total
ratio Gear
ratio: 1st
gear 10:36 3.600:1 12.384:1 2nd
gear 16:34 2.125:1 7.310:1 3rd
gear 25:34 1.360:1 4.678:1 4th
gear 30:29 0.966:1 3.324:1 Reverse
gear 12:42 3.500:1 Axle
ratio: 9:31 3.444:1 Clutch Single
plate dry disc Axle
drive Spiral
bevel pinion and differential Power
transmission Double
constant velocity joints and drive shafts
*All
posted information is from Porsche's Model '77 924 Owner's
Manual
